EMC1403-1-AIA-TR SMSC, EMC1403-1-AIA-TR Datasheet - Page 21

• Manufacturer Part Number: EMC1403-1-AIA-TR
• Description: Board Mount Temperature Sensors TEMP SENSOR W/ BETA COMP
• Manufacturer: SMSC

Specifications of EMC1403-1-AIA-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1°C Temperature Sensor with Beta Compensation
Datasheet
APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the
SMSC EMC1403 / EMC1404
5.5
5.6
5.7
5.8
5.9
Parasitic resistance in series with the external diodes will limit the accuracy obtainable from
temperature measurement devices. The voltage developed across this resistance by the switching
diode currents cause the temperature measurement to read higher than the true temperature.
Contributors to series resistance are PCB trace resistance, on die (i.e. on the processor) metal
resistance, bulk resistance in the base and emitter of the temperature transistor. Typically, the error
caused by series resistance is +0.7°C per ohm. The EMC1403 and EMC1404 automatically correct up
to 100 ohms of series resistance.
The EMC1403 and EMC1404 is designed for external diodes with an ideality factor of 1.008. Not all
external diodes, processor or discrete, will have this exact value. This variation of the ideality factor
introduces error in the temperature measurement which must be corrected for. This correction is
typically done using programmable offset registers. Since an ideality factor mismatch introduces an
error that is a function of temperature, this correction is only accurate within a small range of
temperatures. To provide maximum flexibility to the user, the EMC1403 and EMC1404 provides a 6-
bit register for each external diode where the ideality factor of the diode used is programmed to
eliminate errors across all temperatures.
The EMC1403 and EMC1404 detect an open on the DP and DN pins, and a short across the DP and
DN pins. For each temperature measurement made, the device checks for a diode fault on the external
diode channel(s). When a diode fault is detected, the ALERT pin asserts (unless masked, see
Section
not be checked). A diode fault is defined as one of the following: an open between DP and DN, a short
from V
If a short occurs across DP and DN or a short occurs from DP to GND, the low limit status bit is set
and the ALERT pin asserts (unless masked). This condition is indistinguishable from a temperature
measurement of 0.000degC (-64°C in extended range) resulting in temperature data of 00h in the MSB
and LSB registers.
If a short from DN to GND occurs (with a diode connected), temperature measurements will continue
as normal with no alerts.
The EMC1403 and EMC1404 contain multiple consecutive alert counters. One set of counters applies
to the ALERT pin and the second set of counters applies to the THERM pin. Each temperature
measurement channel has a separate consecutive alert counter for each of the ALERT and THERM
pins. All counters are user programmable and determine the number of consecutive measurements
that a temperature channel(s) must be out-of-limit or reporting a diode fault before the corresponding
pin is asserted.
See
To reduce the effect of noise and temperature spikes on the reported temperature, the External Diode
1 channel uses a programmable digital filter. This filter can be configured as Level 1, Level 2, or
Disabled. The typical filter performance is shown in
Resistance Error Correction (REC)
Programmable External Diode Ideality Factor
Diode Faults
Consecutive Alerts
Digital Filter
Section 6.12
DD
5.8) and the temperature data reads 00h in the MSB and LSB registers (note: the low limit will
Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most
ideality errors.
to DP, or a short from V
for more details on the consecutive alert function.
DD
DATASHEET
to DN.
21
Figure 5.3
and
Figure
5.4.
Revision 1.37 (01-06-10)